Using backgrind wafer tape to enable wafer mounting of bumped wafers

ABSTRACT

A method and apparatus are disclosed for mounting a wafer on a mount and thinning the wafer. The wafer includes a front surface having bumps with an adhesive tape having a backing attached thereto and a back surface. The front surface of the wafer is mounted facedown on a suction surface with the backing of the adhesive tape abutting the surface. The wafer is then suctioned, after which the back surface of the wafer undergoes a grinding process to thin the wafer. Since the backing attached to the bumps on the wafer is substantially planar and sits substantially flat on the suction surface of the wafer mount, the force exerted on the wafer from the thinning process does not overcome the suction force holding the wafer on the wafer mount. Thus, the bumped wafer may be thinned without damaging the bumps and the active surface of the wafer.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of application Ser. No. 09/854,759,filed May 14, 2001, pending.

BACKGROUND

1. Field of the Invention

The present invention relates to a method and apparatus for mounting andthinning a wafer. In particular, the present invention relates to amethod and apparatus for mounting a bumped wafer to a wafer mountingchuck and thinning the wafer to a predetermined thickness.

2. State of the Art

Typically, in a manufacturing process, a plurality of integratedcircuits is simultaneously patterned and defined on the front surface ofa single silicon wafer. The circuits are generally aligned in rows andcolumns in an orthogonal format. After the integrated circuits are fullydefined, the wafer is diced by a singulation machine along lines betweenthe rows and columns, separating the wafer into a plurality ofindividual integrated circuit dice. The integrated circuit dice can thenbe secured within individual packages and/or incorporated intoelectronic devices.

In the typical manufacturing process, the silicon wafer is sliced from agenerally cylindrical ingot. The wafer is at first sliced sufficientlythick so as not to warp or break during the various manufacturingprocesses. However, in some instances, the desired thickness for thefinished dice is less than the initial thickness of the sliced wafer.Therefore, after the integrated circuit patterns are formed on thewafer, it has been necessary to grind the back surface of the wafer toreduce its thickness as desired for the individual integrated circuitdie.

Grinding machines for grinding down the back surfaces of silicon wafersare known in the art. The known machines have chuck tables for securinga plurality of wafers in position to be ground by one or more grindingwheels. Examples of such grinding machines are illustrated in U.S. Pat.No. 5,679,060 (Leonard), U.S. Pat. No. 4,753,049 (Mori), U.S. Pat. No.5,632,667 (Earl), and U.S. Pat. No. 5,035,087 (Nishiguchi).

Currently available wafer processing systems are unsatisfactory,particularly for grinding wafers after the contact pads of theintegrated circuits thereon are bumped, known as bumped wafers.Recently, the market demands the thinning of wafers to about 6 mils orless for chips utilized in ultra-compact applications such as in cellphones. For example, see U.S. Pat. No. 5,476,566 (Cavasin), whichdiscloses a method for thinning wafers by adhesively attaching thewafers to a supporting substrate, but does not disclose thinning wafersafter being bumped. Also, U.S. Pat. No. 6,162,703 (Muntifering et al.),assigned to the assignee of the present invention, discloses a methodfor thinning and singulating dice from an unbumped wafer by adhesivelyattaching the unbumped wafer to a table and precutting notches in theunbumped wafer prior to the thinning thereof. However, for bumpedwafers, it is necessary to thin the wafer after bumping because,currently, the wafer must be at least 12 mils thick to undergo thebumping process without the likelihood of damage thereto. Further, it isimportant that the wafer be held tightly in place during the thinningprocess, typically with a vacuum chuck.

Vacuum chucks include a series of apertures in the surface of the chuckto which a vacuum source is connected. The suction created between thesurface of the chuck and the bottom of the wafer securely holds thewafer in place. For example, see U.S. Pat. No. 6,120,360, assigned tothe assignee of the present invention, which discloses a vacuum chuckmade for securing to the planar face surface of a wafer. However, thevacuum chuck is segmented into quarters and also requires the wafer tobe quartered, resulting in additional process steps and potential forerror in handling four times the number of wafer parts per wafer.

Although vacuum chucks perform very well for wafers having a planar facesurface through which air cannot pass, such vacuum chucks will not workwell for a bumped wafer. Specifically, the required suction forcebetween the surface of the chuck and the active surface of the wafercannot be achieved since the suctioned air will pass through the gapprovided by the bumps formed on the bond pads of the integrated circuitsformed on the surface of the wafer. To overcome such problems, vacuumchucks for bumped wafers are typically made to provide the suction onthe active surface's periphery where there are no bumps. However, suchvacuum chucks do not provide the necessary suction at the wafer'speriphery for effectively holding a bumped wafer for the thinningthereof because there is not enough surface area proximate the wafer'speriphery without the integrated circuits and bumps thereon. As aresult, it has been suggested to increase the area proximate the wafer'speriphery without the integrated circuits and bumps formed on the bondpads thereof to provide greater suction on the wafer. However, thiswould unacceptably limit the number of bumped dice per wafer, therebyresulting in a reduction of yield.

Therefore, it would be advantageous to provide a method and apparatusfor thinning bumped wafers that provide the necessary area for suctionwithout limiting the number of bumped dice on the wafer.

SUMMARY OF THE INVENTION

The present invention relates to a method and apparatus for mounting abumped wafer. The present invention further relates to a method andapparatus for mounting a bumped wafer to a wafer mounting chuck andthinning the wafer.

In a preferred embodiment of the present invention, the wafer includes afront surface and a back surface, the front surface including conductivebumps on the bond pads of the integrated circuits located thereon. Thepresent invention includes an adhesive tape having an adhesive and abacking, the adhesive of the adhesive tape attaching the tape to thefront surface of the wafer and, particularly, to the bumps on the bondpads of the integrated circuits located on the front surface of thewafer. According to the present invention, the adhesive and the tapeattaches to the bumps so that an outer surface of the backing of thetape is substantially planar.

With the adhesive tape attached to the front surface of the wafer, thewafer is mounted, facedown, to a wafer mounting chuck. The wafermounting chuck includes a suction surface with apertures therein whichcommunicate a suction force to the wafer. The suction surface isconfigured to hold the wafer by the suction force applied thereto and,particularly, to hold the outer surface of the adhesive tape which isadhesively attached to the wafer using the suction force appliedthereto. Thus, the outer surface of the adhesive tape provides a largesurface area for holding the wafer via the suction force.

Once the wafer is suctioned facedown to the wafer mounting chuck, thewafer is ready for a thinning process. In particular, the wafer isthinned by removing material from the back surface of the wafer bygrinding or chemical mechanical polishing. In this manner, bumped wafersmay be thinned to less than 12 mils and, preferably, between about 6mils and about 12 mils. After the thinning process, a wafer mount tapeis applied to the back surface of the wafer. The adhesive tape is thenremoved from the active surface of the wafer with the aid of de-tape.The de-tape has a stronger adhesive than that of the adhesive tape sothat the de-tape may be applied to an end portion of the adhesive tapefor peeling the adhesive tape from the front surface of the wafer. Thewafer may then undergo singulation or, rather, the wafer may besegmented into separate integrated circuit dice and/or a plurality ofintegrated circuit dice.

In an aspect of the present invention, the adhesive tape overlying thebumps on the bond pads of the integrated circuits and the front surfaceof the wafer provides an outer surface that is substantially planer sothat the outer surface of the tape is suctionable. Further, the suctionforce is applied to substantially the whole outer surface of the backingin the desired areas so that the force exerted on the wafer from thethinning process does not overcome the suction force holding the waferon the wafer mounting chuck. In this manner, the bumped wafer may bethinned to a desired level or an ultra thin level without damaging thebumps on the bond pads and the integrated circuits formed on the frontsurface of the wafer.

Another aspect of the invention provides that the bumped wafer bethinned to less than 12 mils thick. Since wafers being bumped arecurrently required to be at least 12 mils thick, it is necessary for thebumps to be formed on the wafer before thinning the wafer to the desiredthickness between the preferred range of about 6 mils to about 12 mils.

Other features and advantages of the present invention will becomeapparent to those of skill in the art through a consideration of theensuing description, the accompanying drawings and the appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

While the specification concludes with claims particularly pointing outand distinctly claiming that which is regarded as the present invention,the advantages of this invention may be ascertained from the followingdescription of the invention when read in conjunction with theaccompanying drawings.

FIGS. 1 through 9 illustrate a method and apparatus for mounting a waferhaving bumps to a wafer mounting chuck and then thinning the wafer, inwhich:

FIG. 1 is a simplified top plan view of an active surface of a waferaccording to the present invention;

FIG. 2 is a simplified and enlarged partial cross-sectional view of thewafer depicted in FIG. 1 along line 2, according to the presentinvention;

FIG. 3 is a simplified and enlarged partial cross-sectional view of awafer and an adhesive tape facing each other in an unattached positionaccording to the present invention;

FIG. 4 is a simplified and enlarged partial cross-sectional view of awafer and an adhesive tape facing each other in an attached positionaccording to the present invention;

FIG. 5 is partially a simplified cross-sectional view of a wafer facinga wafer mounting chuck in an unmounted position and partially a diagramof a mounting apparatus and a vacuum integrated with the wafer mountingchuck, according to the present invention;

FIG. 6 is partially a simplified cross-sectional view of a wafer facinga wafer mounting chuck in a mounted position and partially a diagram ofa mounting apparatus and a vacuum integrated with the wafer mountingchuck, according to the present invention;

FIG. 7 is a simplified cross-sectional view of a wafer positioned on awafer mounting chuck with a wafer mount tape being applied on the backsurface of the wafer;

FIG. 8 is a simplified cross-sectional view of the adhesive tape beingremoved from the front surface of the wafer with the wafer mount tapemaintained on the back surface of the wafer; and

FIG. 9 is a simplified cross-sectional view of a wafer having the wafermount tape on the back surface of the wafer and a dicing apparatus forsingulating the wafer according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments of the present invention will be hereinafterdescribed with reference to the accompanying drawings. It should beunderstood that the illustrations are not meant to be actual views ofany particular apparatus and/or method, but are merely idealizedrepresentations which are employed to more clearly and fully depict thepresent invention than would otherwise be possible. Additionally,elements and features common between the figures retain the samenumerical designation.

Depicted in drawing FIGS. 1 through 7 are a method and apparatus formounting a bumped wafer and then thinning the bumped wafer. Turning todrawing FIG. 1, there is illustrated a top plan view of a wafer 110. Thewafer 110 includes a front surface 112 and a back surface 114 (see FIG.2). The front surface 112 of the wafer 110 includes individualintegrated circuits separated by street indices or streets 118. Thestreet indices 118 are arranged in horizontal rows and vertical columnsand define individual integrated circuit dice 116 in the wafer 110. Thewafer 110 preferably is made of silicon or gallium arsenide, althoughany semiconductor material may be used such as germanium, lead sulfideand silicon carbide.

Depicted in drawing FIG. 2 is a partial cross-sectional view of thewafer 110 taken along line 2 in drawing FIG. 1. On the front surface 112of the wafter 110 there are conductive bumps 120 on the bond pads of theintegrated circuits made to ultimately provide external interconnectionsfor the integrated circuits in each of the individual integrated circuitdice 116. The conductive bumps 120 are preferably ball shaped, but maybe shaped as columns and/or studs. The conductive bumps 120 may beformed of any known conductive material or alloy thereof, such assolder, lead, tin, copper, silver and/or gold and conductive polymersand/or conductive composites. The conductive bumps 120 are typicallybonded to the wafer 110 through a reflow process at a predeterminedtemperature dependent upon the material properties of the conductivebumps 120. Currently, in order for the wafter 110 to successfullyundergo the process steps of bonding the conductive bumps 120 thereto,the wafer should be at least 12 mils thick. Therefore, according to thepresent invention, it is necessary for the bumps to be formed on thewafer before thinning the wafer to the desired thickness, currently,such as between about 6 mils and about 12 mils, although the wafer maythinned to any desired thickness less than 6 mils.

Depicted in drawing FIG. 3 is the wafer 110 and an adhesive tape 130,such as backgrind tape, prior to being in an attached position. Theadhesive tape 130 includes an adhesive 132 with an adhesive surface 134and a backing 136 with an outer surface 138. The outer surface 138 ofthe backing 136 is nonadhesive. The adhesive 132 used for the adhesivetape 130 may be, but is not limited to, a pressure sensitive siliconeadhesive, acrylic adhesive, UV curable adhesive, and/or any adhesivethat allows the tape to be easily removed without damaging the wafer110. It is also desirable for the adhesive 132 on the adhesive tape 130to leave a nonconductive ash when it oxidizes or bums to prevent anypotential problems of electrical connections with any portion of thewafer 110 and the individual integrated circuit dice 116. The backing136 for the adhesive tape 130 may be of a polymer material or paper orthe like. As such, the backing 136 may be rigid or flexible so long asthe backing 136 is substantially planar for mounting the wafer 110(discussed further below). Further, the backing 136 should be ofsufficient strength so that it will not easily tear.

Referring to drawing FIG. 4, the adhesive tape 130 is adhesively placedand attached to the conductive bumps 120 to overlie the front surface112 of the wafer 110. The adhesive tape 130 is preferably substantiallythe size of the wafer 110 so that it overlies each of the conductivebumps 120. The adhesive tape may also overlie portions of the wafer 110without the conductive bumps 120 thereon, namely a periphery of thefront surface 112, to provide protection of the front surface 112. Suchpositioning of the adhesive tape 130 may be accomplished manually and/orby machinery.

As depicted in drawing FIG. 4, the adhesive 132 attached to theconductive bumps 120 may conform to and/or abut the conductive bumps 120so that the adhesive 132 attaches between about 10% and about 60% of thebumps'surface area. The range of necessary surface area for sufficientattaching depends on the type of adhesive 132 employed, as known in theart. As such, it is desired that the adhesive 132 has sufficientstrength to withstand a grinding process (discussed further below).Further, an important feature of the present invention is that theadhesive tape conforms to the conductive bumps 120 in a manner thatallows the outer surface 138 of the backing 136 to be substantiallyplanar.

Referring to drawing FIG. 5, there is shown a cross-sectional view ofthe wafer 110 and a wafer mounting chuck 150 prior to the wafer 110being mounted thereon. As shown, the wafer 110 is inverted with itsfront surface 112 facedown so that the substantially planar outersurface 138 of the backing 136 of the adhesive tape 130 is facing thewafer mounting chuck 150. The wafer mounting chuck 150 includes asuction surface 152 on which the substantially planar outer surface 138is to be attached or mounted. The suction surface 152 includes apertures154 that communicate with the chamber 156 in the wafer mounting chuck150. The chamber 156 in turn communicates with a vacuum 160 whichprovides suction at the suction surface 152. The vacuum 160 isintegrated with a mounting apparatus 162 to which the wafer mountingchuck 150 is connected. The number of apertures 154 in the suctionsurface 152 may vary depending on the required suction involved, whichmay be determined by one of ordinary skill in the art. For example, aplurality of closely spaced, minuscule apertures 154 having smalldiameters may be provided. Alternatively, the apertures 154 may belarger and more spread out.

As shown in drawing FIG. 6, the wafer 110 with its front surface 112facedown is placed on the wafer mounting chuck 150 to be suctionedthereto. In particular, the substantially planar outer surface 138 sitsflat against the suction surface 152 of the wafer mounting chuck 150 sothat the wafer 110 may be suctioned to the mounting apparatus 162 viathe vacuum 160. In this manner, the planarity of the outer surface 138of the adhesive tape 130 allows the vacuum 160 to provide a suctionforce 166 through the apertures 154 that sufficiently secures the wafer110 to the suction surface 152 without substantial leakage affecting thesuction force 166. In the suctioned position, the back surface 114 ofthe wafer 110 faces upward in an exposed position.

The back surface 114 of the wafer 110 is then processed through a normalback-grind or back-lap process to thin the wafer to a desired thicknessby a grinder 164. The grinder 164, as depicted in drawing FIG. 6, isonly intended to represent a generic wafer back-grinding tool. In thegrinding operation, the wafer 110 may be moved to successive grindingstations with grinding wheels of decreasing grain size and abrasivenessso that the roughness of the back surface 114 is successively decreased.As such, the wafer 110 is thinned to a predetermined thickness 168 (FIG.7) of less than about 12 mils and, preferably, the wafer is thinned tobetween about 6 mils and about 12 mils, although the wafer may bethinned to any desired thickness, such as less than 6 mils.

According to the present invention, it is well appreciated that theplanarity of the outer surface 138 of the adhesive tape 130 providessufficient suction force to be applied on the suction surface 152 of thewafer mounting chuck 150 and on the wafer 110 to undergo grindingwithout damaging the wafer 110 or without wafer movement. Further, theincreased application of a suction force that the adhesive tape 130provides allows thinning of the wafer 110 to the predetermined thickness168 after being bumped.

After backgrinding the wafer 110, the wafer 110 may remain on the wafermounting chuck 150 or be moved to another type of wafer mount chuck 170,such as a chuck 170 with vacuum ports 174 about a chuck periphery 172and an air gap 176 at a center portion of the chuck 170 (as shown indrawing FIG. 7). As such, the wafer 110 is suctioned to the wafer mountchuck 170 via the vacuum ports 174 with the back surface 114 of thewafer 110 exposed. A wafer mount tape 180 having an adhesive surface 182is then applied to the back surface 114 of the wafers 110 and to a filmframe 184. A lamination roller 186 may be provided to aid in theadhesive attachment of the wafer mount tape 180 to the back surface 114of the wafer 110 by simply rolling the lamination roller 186 thereon. Inthe case of the wafer 110 being placed on the chuck 170 having an airgap 176, air pressure is provided in the air gap 176 to prevent thelamination roller 186 from cracking, breaking or causing fatigue to thewafer 110. Any excess wafer mount tape 180 may then be removed using atape blade 188 or any well-known removing device used in the art.

As illustrated in drawing FIG. 8, the wafer 110 is removed from thewafer mount chuck 170 in preparation for removing the adhesive tape 130.Removing the adhesive tape 130 may be accomplished using “de-tape” 192,which has a stronger adhesive than that of the adhesive tape 130. Assuch, the de-tape 192 may be attached to an end portion of the adhesivetape 130 to peel the adhesive tape 130 from the front surface 112 of thewafer 110. As previously set forth, after removing the adhesive tape130, it is desirable for the adhesive 132 on the adhesive tape 130 toleave a nonconductive ash through oxidation or burning to prevent anypotential problems of the electrical connections with any portion of thewafter 110 and the individual integrated circuit dice 116.

The wafer 110 with the wafer mount tape 180 on its back surface 114 isthen prepared for dicing or a singulating process. As illustrated indrawing FIG. 9, the wafer 110 is sitting with its bumps exposed to thedicing apparatus 196. As such, the wafer 110 is diced along the streetindices or streets 1 18 (see FIG. 1) into individual integrated circuitdice 116 by the dicing apparatus 196. After dicing, the wafer mount tape180 on the back surface 114 of each of the segmented integrated circuitdice 116 may be removed therefrom by suitable pick and place equipment(not shown) in preparation for further processing of the integratedcircuit dice 116.

The above descriptions and drawings are only illustrative of preferredembodiments which achieve the objects, features and advantages of thepresent invention, and it is not intended that the present invention belimited thereto. Any modification of the present invention which comeswithin the spirit and scope of the following claims is considered partof the present invention.

1. A wafer having bumps on a surface thereof for a material removaloperation, comprising: a tape having an adhesive and a backing attachedto at least a portion of said bumps of said surface having bumps thereonof said wafer, said tape conforming at least a portion of said adhesiveof said tape to said bumps, said backing of said tape has asubstantially planar surface after said conforming.
 2. The wafer ofclaim 1, further comprising: a wafer mount having a suction surfacetemporarily connected to the backing of said tape using a suction force.3. The wafer of claim 2, further comprising: said wafer cut to form atleast one semiconductor die after removing wafer material from said backsurface.
 4. The wafer of claim 3, further comprising a portion of saidadhesive removed from said wafer prior to said cutting.
 5. The wafer ofclaim 1, wherein said attaching a tape having an adhesive and a backingconforms said backing to include a substantially planar surface on atleast a portion thereof.
 6. The wafer of claim 1, wherein said attachinga tape having an adhesive and a backing conforms at least a portion ofsaid adhesive of said tape to said bumps to form a substantially planarsurface on said backing of said tape.
 7. The wafer of claim 1, whereinsaid wafer comprises a wafer having a thickness of at least about 12mils.
 8. The wafer of claim 1, wherein said wafer has a thickness in therange of between about 6 mils and about 12 mils.
 9. The wafer of claim1, wherein said wafer has a back surface ground to remove materialtherefrom.
 10. The wafer of claim 1, wherein said wafer has materialremoved therefrom by chemical-mechanical polishing said back surface ofsaid wafer.
 11. The combination of a wafer having bumps on a surfacethereof and a mount for a material removal operation comprising: a tapehaving an adhesive and a backing attached to at least a portion of saidbumps of said surface having bumps thereon of said wafer, said tapeconforming at least a portion of said adhesive of said tape to saidbumps, said backing of said tape has a substantially planar surfaceafter said conforming; and a wafer mount having a suction surfacetemporarily connected to the backing of said tape using a suction force.12. The combination of claim 11, wherein said attaching a tape having anadhesive and a backing conforms said backing to include a substantiallyplanar surface on at least a portion thereof.
 13. The combination ofclaim 11, wherein said attaching a tape having an adhesive and a backingconforms at least a portion of said adhesive of said tape to said bumpsto form a substantially planar surface on said backing of said tape. 14.The combination of claim 11, wherein said wafer comprises a wafer havinga thickness of at least about 12 mils.
 15. The combination of claim 11,wherein said wafer has a thickness in the range of between about 6 milsand about 12 mils.
 16. The combination of claim 11, wherein said waferhas a back surface ground to remove material therefrom.
 17. Thecombination of claim 11, wherein said wafer has material removedtherefrom by chemical-mechanical polishing said back surface of saidwafer.
 18. An in-process wafer having bumps on a surface thereof for amaterial removal operation, comprising: a tape having an adhesive and abacking attached to at least a portion of said bumps of said surfacehaving bumps thereon of said wafer, said tape conforming at least aportion of said adhesive of said tape to said bumps, said backing ofsaid tape has a substantially planar surface after said conforming. 19.The wafer of claim 18, further comprising: a wafer mount having asuction surface temporarily connected to the backing of said tape usinga suction force.
 20. The wafer of claim 19, further comprising: saidwafer cut to form at least one semiconductor die after removing wafermaterial from said back surface.
 21. The wafer of claim 20, furthercomprising a portion of said adhesive removed from said wafer prior tosaid cutting.
 22. The wafer of claim 18, wherein said attaching a tapehaving an adhesive and a backing conforms said backing to include asubstantially planar surface on at least a portion thereof.
 23. Thewafer of claim 18, wherein said- attaching a tape having an adhesive anda backing conforms at least a portion of said adhesive of said tape tosaid bumps to form a substantially planar surface on said backing ofsaid tape.
 24. The wafer of claim 18, wherein said wafer comprises awafer having a thickness of at least about 12 mils.
 25. The wafer ofclaim 18, wherein said wafer has a thickness in the range of betweenabout 6 mils and about 12 mils.
 26. The wafer of claim 18, wherein saidwafer has a back surface ground to remove material therefrom.
 27. Thewafer of claim 18, wherein said wafer has material removed therefrom bychemical-mechanical polishing said back surface of said wafer.
 28. Awafer having bumps on a surface thereof in a process for a materialremoval operation, comprising: a tape having an adhesive and a backingattached to at least a portion of said bumps of said surface havingbumps thereon of said wafer, said tape conforming at least a portion ofsaid adhesive of said tape to said bumps, said backing of said tape hasa substantially planar surface after said conforming.
 29. The wafer ofclaim 28, further comprising: a wafer mount having a suction surfacetemporarily connected to the backing of said tape using a suction force.30. The wafer of claim 29, further comprising: said wafer cut to form atleast one semiconductor die after removing wafer material from said backsurface.
 31. The wafer of claim 30, further comprising a portion of saidadhesive removed from said wafer prior to said cutting.
 32. The wafer ofclaim 28, wherein said attaching a tape having an adhesive and a backingconforms said backing to include a substantially planar surface on atleast a portion thereof.
 33. The wafer of claim 28, wherein saidattaching a tape having an adhesive and a backing conforms at least aportion of said adhesive of said tape to said bumps to form asubstantially planar surface on said backing of said tape.
 34. The waferof claim 28, wherein said wafer comprises a wafer having a thickness ofat least about 12 mils.
 35. The wafer of claim 28, wherein said waferhas a thickness in the range of between about 6 mils and about 12 mils.36. The wafer of claim 28, wherein said wafer has a back surface groundto remove material therefrom.
 37. The wafer of claim 28, wherein saidwafer has material removed therefrom by chemical-mechanical polishingsaid back surface of said wafer.
 38. A wafer having bumps on a surfacethereof in a material removal operation, comprising: a tape having anadhesive and a backing attached to at least a portion of said bumps ofsaid surface having bumps thereon of said wafer, said tape conforming atleast a portion of said adhesive of said tape to said bumps, saidbacking of said tape has a substantially planar surface after saidconforming.
 39. The wafer of claim 38, further comprising: a wafer mounthaving a suction surface temporarily connected to the backing of saidtape using a suction force.
 40. The wafer of claim 39, furthercomprising: said wafer cut to form at least one semiconductor die afterremoving wafer material from said back surface.
 41. The wafer of claim40, further comprising a portion of said adhesive removed from saidwafer prior to said cutting.
 42. The wafer of claim 38, wherein saidattaching a tape having an adhesive and a backing conforms said backingto include a substantially planar surface on at least a portion thereof.43. The wafer of claim 38, wherein said attaching a tape having anadhesive and a backing conforms at least a portion of said adhesive ofsaid tape to said bumps to form a substantially planar surface on saidbacking of said tape.
 44. The wafer of claim 38, wherein said wafercomprises a wafer having a thickness of at least about 12 mils.
 45. Thewafer of claim 38, wherein said wafer has a thickness in the range ofbetween about 6 mils and about 12 mils.
 46. The wafer of claim 38,wherein said wafer has a back surface ground to remove materialtherefrom.
 47. The wafer of claim 38, wherein said wafer has materialremoved therefrom by chemical-mechanical polishing said back surface ofsaid wafer.
 48. The combination of a wafer having bumps on a surfacethereof and a mount in a material removal operation comprising: a tapehaving an adhesive and a backing attached to at least a portion of saidbumps of said surface having bumps thereon of said wafer, said tapeconforming at least a portion of said adhesive of said tape to saidbumps, said backing of said tape has a substantially planar surfaceafter said conforming; and a wafer mount having a suction surfacetemporarily connected to the backing of said tape using a suction force.49. The combination of claim 48, wherein said attaching a tape having anadhesive and a backing conforms said backing to include a substantiallyplanar surface on at least a portion thereof.
 50. The combination ofclaim 48, wherein said attaching a tape having an adhesive and a backingconforms at least a portion of said adhesive of said tape to said bumpsto form a substantially planar surface on said backing of said tape. 51.The combination of claim 48, wherein said wafer comprises a wafer havinga thickness of at least about 12 mils.
 52. The combination of claim 48,wherein said wafer has a thickness in the range of between about 6 milsand about 12 mils.
 53. The combination of claim 48, wherein said waferhas a back surface ground to remove material therefrom.
 54. Thecombination of claim 48, wherein said wafer has material removedtherefrom by chemical-mechanical polishing said back surface of saidwafer.
 55. A wafer mount assembly and a wafer having a front surfacehaving at least one bump thereon and a back surface, comprising: anadhesive tape having an adhesive and a planar backing for a vacuumattachment, said adhesive tape for adhesively attaching a portion ofsaid front surface of said wafer having said at least one bump thereonto a portion of said wafer mount assembly by said planar backing for avacuum attachment.
 56. The assembly of claim 55, further comprising: awafer mount having a vacuum surface thereon, said vacuum surface of saidwafer mount for abutting at least a portion of said backing of saidadhesive tape, said vacuum surface including apertures therein forcommunicating a vacuum therethrough.
 57. The assembly of claim 55,wherein said backing of said adhesive tape includes a substantiallyplanar surface for overlying said at least one bump.
 58. The assembly ofclaim 57, wherein said substantially planar surface of said backing ofsaid adhesive tape provides an area for the application of a vacuum toat least a portion of said front surface of said wafer.
 59. The assemblyof claim 55, wherein said backing includes a substantially planarsurface overlying said at least one bump.
 60. The assembly of claim 55,wherein said adhesive attaches to said at least one bump.
 61. Theassembly of claim 55, wherein said adhesive conforms to said at leastone bump to form a substantially planar surface on at least a portion ofsaid backing.
 62. The assembly of claim 55, wherein said adhesive tapesubstantially overlies another bump.
 63. The assembly of claim 55,wherein said wafer comprises a wafer having a thickness of at least 12mils.
 64. The assembly of claim 55, wherein said at least one bumpcomprises a conductive bump for electrical connection.
 65. An assemblyof a bumped wafer and a wafer mount for grinding, the assemblycomprising: a wafer having a front surface and a back surface thereof,said front surface having at least one bump thereon; and a tape havingan adhesive and a planar backing for vacuum attachment, said tape foradhesively attaching a portion of said front surface of said waferhaving said at least one bump thereon.
 66. The assembly of claim 65,wherein said backing includes a substantially planar surface overlyingsaid at least one bump.
 67. The assembly of claim 65, wherein saidadhesive attaches to said at least one bump for forming a substantiallyplanar surface oh said backing.
 68. The assembly of claim 65, whereinsaid adhesive conforms to said at least one bump to form a substantiallyplanar surface on a portion of said backing.
 69. The assembly of claim65, wherein said tape substantially covers said front surface of saidwafer.
 70. The assembly of claim 65, wherein said at least one bumpcomprises a conductive bump for electrical connection.
 71. The assemblyof claim 65, wherein said backing comprises a resilient material. 72.The assembly of claim 65, wherein said wafer comprises a thickness of atleast 12 mils prior to being mounted to said wafer mount.
 73. Theassembly of claim 65, wherein said wafer comprises another thickness ofone of about less than 6 mils and greater than about 6 mils and lessthan about 12 mils after grinding said back surface of said wafer.